Molding device



Feb 23, 19.32. T. J. EVANS ET AL I 1,846,028

MOLDI NG DEVICE Filed Jan. 29, 1931 3 Sheets-Sheet 1 i Exams J9 ThomasJZm/w Feb. 23, 1932. J/EVANS ET AL 1,846,028

MOLDING 'DEVICE Filed Jan. 29. 1931 3 Sheets-Sheet 2 Feb 23, 1932. T..J. EVANS ET AL MOLDING DEVICE Filed Jan. 29, 1931 3 Sheets-Sheet 3flahozdlmms v A t 0 my W////// 7/ /4 M m v ////////w Patented Feb. 23,1932 UNITED STATES PATENT OFFICE THDIIAS 3'. EVANS AND HAROLD; EVANS, FBLUE ISLAND, ILLINOIS MOLDING DEVICE 'Application filed January 29,1931.

The invention relates to molds for use in the foundry art, its objectsbeing to simplify, expedite and reduce the cost of molding operations;and it consists of a permanent flask element, preferably of metal, aplurality of laterally interlocking solid elements, of refractorymaterial, seated within the flask and collectively lining the side wallsthereof and forming the exterior walls of the moldn ing chamber, and topand bottom elements of similar material defining the upper and lowerends of such chamber.

While the device may take various forms, one enemplification of it ishereinafter described and is illustrated in the accompanymg drawings, inwhich ig. 1 is a plan view of the flask element;

Figs. 2 and 3 are sectional views on the lines 2-2 and 3-3,respectively, of Fig. 1, the cope element being added;

Fig. i is a sectional view on the line 4--4: of Fig. 3; and

Fig. 5 shows in perspective, in one instance partly in section, thevarious elements of the device disassembled.

The specific device selected as a typical embodiment of the invention isdesigned for the production of a chambered follower constituting anelement of a well known draft gear for railway cars.

The flask element 10 is preferably of metal and takes the form of a boxhaving a bottom and an open top, its side walls being slightly flaringto facilitate the discharge by dumping of its contents, upon thecompletion of the molding operation,-trunnions 11, 11, be-

ing preferably formed on two of its side walls to provide for theconvenient transporting of the flask, as by an air hoist, and its over-10 turning for dumping.

The molding chamber 12 is exteriorly defined by, and its walls consistof, a plurality of mating plates of granular material, usually formed ofsand and a bonding material and baked. One such element may be seatedSerial No. 511,993.

upon the bottom of the flask, another constituting the cope and beingapplied to its top. The side walls of the flask may be provided withpockets, as 13, 14, 15 and 16, open at the top, into which elements, as17, 18, which form a lining for the flask and the side walls of themolding chamber, are entered, these pockets being preferably tapereddownwardly to facilitate the insertion and removal of the plates.

Preferably these pockets, or some of them, are transversely in dove-tailform, in order to retain the plate elements in position. shown, thisconfiguration is given to the pocka ets 13 and 15, the pockets 14 and 16having parallel side walls.

The several plate elements are of greater thickness than the depth ofthe pockets within which they seat and contiguous elements interlock,certain of them, as 18, 18, being rabbeted along their side margins, theelements 17, 17, fitting within these rabbets.

As plainly shown in Fig. 4:,the elements 17, 17 are retained in place byreason of the inward converging of the side walls of the pockets withinwhich they are entered, the sides of these elements beingcorrespondingly inclined; and the elements 18, 18 are secured withintheir pockets by the engagement of adjacent elements with their rabbetedside margins.

The bottom of the flask is protected from the heat by a plate 19 restingthereon and interfltting between the lower end portions of the elements17 18. As the structure chosen to illustrate the invention is intendedto produce a hollow casting, a core element 22 is employed to formtheinner and upper walls of the molding chamber and rests upon the plate19, with which it is preferably integral.

The end of the casting is to be hollow, its chamber being crossed byribs. For the purpose of producing this chambered end a core element 23,having the general form of a grid, is placed above the central core 22,be-

; consequently there is a ing spaced therefrom and from the cope 20. Theends of this grid are of the same contour and size as the ends of theelements 18 upon which they rest, and consequently interlock with theelements 17. The casting being desirably formed with a central hole in1ts closed end, a coreelement 24, in the form of a pin or plug, is setthrou h a suitable aperture in the element 23 an fitted within a recessin the end of the element 22, its length being such that it makescontact with the cope 20.

A suitable pouring gate is provided. Preferably one wall of the flask isprovided with an external boss 25, within which is formed a pocketopening throughthe upper margin of the wall for receiving a refractoryblock 26, perforated, as shown at 27, 28, one end of the perforationopening through the upper, end

of the block and the other end through its inner side wall, which fitssnugly against one of the side cores, as 17, which is apert-ured, as

shown at 29, to register with the opening 28, thus forming a sprue. Thecope is provided with an aperture 30, registering with the opening 27 inthe block 26. The molten metal poured in at 30 reaches the moldingchamber 12 through the sprue apertures 29.

The various lining elements are fitted together with nicety to preventthe formation of fins on the casting, and, if desired, the

' joints may be luted.

By means of the device as described no sand is used in the formation ofthe mold, and eat saving of labor and time, the preparation of the moldfor each casting operation is quickly accomplished and without requiringthe employment 0 skilled workmen.

The flask may be made of any size or form suitable to the work in hand,it being essential only, that it be capable of receiving and properlypositioning a plurality of elements of suitable form to provide thenecessary molding chamber.

We claim as our invention 1. In a molding device, in combination, aflask having vertical pockets in its side walls,

I and refractory elements engageable with the pockets, a refractorylining for the bottom of the flask, and a refractory cope covering theflask, the named refractory elements forming the molding chamber.

2. In amolding device, in combination, a flask having vertical pocketsin its side walls, certain of such pockets being of dove tail form incross section, refractory elements engageable with the pockets andcollectively forming the side walls of the molding chamber, a refractorylining for the bottom of the flask, and a cope covering the chamber, thenamed refractory elements forming the molding chamber. V

3. In a molding device, in combination, a

flask having vertical pockets in its side walls,

relatively interlocking refractory elements engageable with the pocketsand collectlvely forming the side walls of the molding chamber, arefractory lining for the bottom of the flask, and a 'cope covering thechamber.

' 4. In a moldin device, in combination, a unitary metallic ask havingside walls and a bottom, a plurality of interlocking elements ofrefractory material seated against the side walls of the flask, elementsof like character at the bottom and top of the flask, the named elementsconstituting the Walls of the molding chamber.

5. In a molding device, in combination, a metallic flask having sidewalls and a bottom, a plurality of interlocking elements of refractorymaterial seated against the side walls of the flask, elements of likecharacter at the bottom and top of the flask, the named elementsconstituting the walls of the molding chamber, and an internal coreelement supported by and seated upon the bottom refractory element.

6. In a molding device, in combination, a unitary metallic flask havingside walls and a bottom, a plurality of interlocking elements ofrefractory material seated against the side walls of the flask, elementsof like character at the bottom and top of the flask, the named elementsconstituting the walls of the molding chamber, and a block formed ofcore material and seated in an alcove in a side wall of the flask andhaving a pouring gate opening communication with the molding chamberthrough one of its side walls.

7. In a molding device, in combination, a metallic flask having sidewalls and a bottom, the inner face of one of its walls having a verticalpocket, the side walls of which are of dove-tail form, and linerelements of refractory material adapted to seat against the flask wallsand to mutually interlock one of the elements fitting within the namedpocket, and

elements of like character for covering the bottom and top of the flask,such refractory elements being configured to collectively define theexterior of the molding chamber.

8. In a molding device, a casing rectangular in cross section and havinga bottom wall, a the side walls of the casing being vertically recessed,the side marginal walls of one of such recesses being of dove-tail form,a plate of the casing, plates of refractory material seated Within therecesses in the side walls of the casing, the margins of adjacent plateshaying rabbeted engagement and a plate of refractory material coveringthe upper end of the casing.

10. In a molding device, in combination, a flask having side and bottomwalls, plates of refractory material seated against the side 1W Wallsadjacent plates being interlocked, a lining of refractory material forthe bottom of the flask, and a refractory cope covering the flask, thenamed refractory elements collectively forming the molding chamber.

In testimony whereof we aflix our signatures.

THOMAS J. EVANS. HAROLD EVANS.

